title: Collision lesion of mandible--coexistence of keratocystic odontogenic tumor with central giant cell granuloma: a rare case report.
abstract: OBJECTIVE
  An odontogenic keratocyst (OKC) or keratocystic odontogenic tumor (KCOT) and giant cell granuloma (GCG) in the jaws are common lesions which have been studied extensively in detail over the years. However, a lesion showing features of both is exceptionally rare and is reported only twice in the literature till date.
  
  
  METHODS
  A rare case of OKC in mandible showing foci of GCG like areas is reported in a 29 years old male patient.
  
  
  CONCLUSIONS
  It seems to be a collision lesion, though the possibility of KCOT showing a reactive response to form giant cells or it being a rare variant cannot be totally ruled out.
  
  
  CONCLUSIONS
  This entity requires aggressive treatment since biological behavior of this unique lesion is difficult to predict unless more of such lesions are reported and followed up in future.
authors.affiliation: Department of Oral Pathology, MS Ramaiah Dental College and Hospital, Bengaluru, Karnataka, India. drspoorti@gmail.com
authors.forename: Spoorthi B
authors.initials: SB
authors.lastname: Ravi
authors.forename: C
authors.initials: C
authors.lastname: Prashanthi
authors.forename: Vinayak
authors.initials: V
authors.lastname: Karun
authors.forename: Mahesh
authors.initials: M
authors.lastname: Melkundi
authors.forename: Sanjay
authors.initials: S
authors.lastname: Nyamati
authors.forename: H B
authors.initials: HB
authors.lastname: Annapoorna
mesh_terms: D000328:Adult; D002467:Cell Nucleus / Q000473:pathology; D003238:Connective Tissue / Q000473:pathology; D003937:Diagnosis, Differential; D004848:Epithelium / Q000473:pathology; D015726:Giant Cells / Q000473:pathology; D006101:Granuloma, Giant Cell / Q000473:pathology*; D006801:Humans; D008297:Male; D008336:Mandibular Diseases / Q000473:pathology*; D008339:Mandibular Neoplasms / Q000473:pathology*; D009807:Odontogenic Cysts / Q000473:pathology; D009808:Odontogenic Tumors / Q000473:pathology*